Doosan DE08TS, Manual

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DE08TS Diesel Engines Major Maintenance 26
Condition Causes Remedies
5) Engine noisy For noises arise compositely such
as rotating parts, lapping parts etc.,
there is necessity to search the
cause of noises accurately.
(1) Crankshaft
•
As the wear of bearing or crankshaft Replace bearing &
progress, the oil clearances increase. grind crankshaft
•
Lopsided wear of crankshaft Grind or replace
•
Oil supply insufficient due to oil Clean oil passage
passage clogging
•
Stuck bearing Replace bearing & Grind
(2) Con rod and
•
Lopsided wear of con rod bearing Replace bearing
Con rod bearing
•
Lopsided wear of crank pin Grind crankshaft
•
Connecting rod distortion Repair or replace
•
Stuck bearing Replace & grind crankshaft
•
Oil supply insufficiency as clogging Clean oil passage
at oil passage progresses
(3) Piston, piston pin &
•
Piston clearance increase as the Replace piston & piston ring
piston ring wear of piston and piston ring
progresses
•
Wear of piston or piston pin Replace
•
Piston stuck Replace piston
•
Piston insertion poor Replace piston
•
Piston ring damaged Replace piston
(4) Others
•
Wear of crankshaft, thrust bearing Replace thrust bearing
•
Camshaft end play increased Replace thrust plate
•
Idle gear end play increased Replace thrust washer
•
Timing gear backlash excessive Repair or replace
•
Valve clearance excessive Adjust valve clearance
•
Abnormal wear of tappet, cam Replace tappet, cam
•
Turbocharger inner part damaged Repair or replace
6) Fuel Consumption
•
Injection timing incorrect Adjust
Excessive
•
Fuel injection amount excessive Adjust injection pump
7) Oil Consumption Excessive
(1) Oil level elevated
•
Clearance between cylinder liner & piston Replace
•
Wear of piston ring, ring groove Replace piston, piston ring
•
Piston ring’s damage, stick, wear Replace piston ring
•
Piston ring opening’s disposition improper Correct position
•
Piston skirt part damaged or Replace piston
abnormal wear
•
Oil ring’s oil return hole clogged Replace piston ring
•
Oil ring’s contact poor Replace piston ring
(2) Oil level lowered
•
Looseness of valve stem & guide Replace in set
•
Wear of valve stem seal Replace seal
•
Cylinder head gasket’s leak Replace gasket
(3) Oil leak
•
Looseness of connection parts Replace gasket, repair
•
Various parts’ packing poor Replace packing
•
Oil seal poor Replace oil seal